Two French climbers and a Canadian were still missing on Monday, police said, after an avalanche killed at least nine people ahead of an attempt on one of the world's highest mountains.

"We have now stopped helicopter rescue operations. Two French and a Canadian mountaineer are still missing. Sherpa guides are in the mountains searching for them," said district police chief Basanta Bahadur Kunwar.

Nepal's tourism board had earlier put the missing figure at seven, but police said four of those were among 13 already rescued on Sunday.

Mr Kunwar said five mountaineers had been airlifted from among the survivors at Manaslu base camp on Sunday and were being treated in Kathmandu.

"The other eight mountaineers who are at the base camp have not sustained any injuries. They have said they will either walk down or will make an attempt to reach the peak again and have told officials that they should not be rescued."

Police said the group of climbers were near the top of the 8,156-metre Manaslu, one of the world's deadliest peaks, when they were hit by a wall of snow as they were sleeping on Saturday night.

Harrowing accounts of the avalanche began to emerge from survivors being treated in Kathmandu.

"All of a sudden, there was darkness. I could imagine that we were buried under an avalanche," Andreas Reiter, 26, of Germany, was quoted as telling the Himalayan Times from his hospital bed.

"I witnessed one of the team members die."

SNGM vice-president Christian Trommsdorff described the French victims as three mountain guides from the Chamonix area in the Alps and four of their clients, who were part of two expeditions.

The avalanche happened at about 7,400 metres and carried away part of camp number three at 6,800 metres, Mr Trommsdorff said.

Among those reported missing was a doctor from the French-speaking Canadian province of Quebec, cardiologist Dominique Ouimet, the man's sister said.

"The tents seem to have disappeared because the avalanche came by," Isabelle Ouimet told Radio Canada, adding that her brother was at camp three when the avalanche struck.

The tourism ministry had earlier said that a German and Spanish man had died alongside a male local guide. The gender of the other dead and injured was unclear.

However, a German foreign ministry spokesman said there was no official confirmation that a German national had been killed.

Manaslu, the eighth highest mountain in the world, is considered one of the most dangerous, with scores of deaths in recent years and just a few hundred successful ascents.

Laxmi Dhakal, head of the home ministry's disaster response division, confirmed the avalanche had hit camp three and said it had created "a flood of snow".

Nepal is home to eight of the world's 14 peaks over 8,000 metres, including the world's highest, Mount Everest, and attracts thousands of mountaineers every year.

Most come in the spring, when Himalayan conditions are at their best, but there is also a short climbing season in late September and October after the monsoon rains end.

Nepal's worst-ever climbing disaster happened in 1995 when a huge avalanche struck the camp of a Japanese trekking group in the Mount Everest region, killing 42 people including 13 Japanese.

Manaslu saw its worst disaster when a South Korean expedition was buried by snow while attempting to climb the north-east face in 1972. The 15 dead included 10 Sherpas and the Korean expedition leader.